VVCR allows you to route different audio tracks over specific output types or individual destinations. The audio channels are recognized as stereo pairs.
Select your stream and click on the Output Audio Tracks tab.
This tab appears on all streams, even if they just have one audio track.
Click on the dropdown menus to assign the tracks. The two options are RTMP Output Audio Track and SRT Output Audio Track. This will then route the selected audio track to all RTMP outputs or SRT outputs for that stream.
The Passthrough option will send all audio channels if the decoder can accept multiple channels. If not, the decoder will receive Track 1.
Click here to learn more about routing audio channels for destinations.